Synthesis of a coherence function by manipulation of the spectral phase of low-coherent light with a segmented liquid-crystal phase modulator and its application in a low-coherence interferometry are described. Effects of space–time coupling caused at diffractive gratings and second-order dispersion at the spatial light modulator on the coherence function synthesis are theoretically and experimentally verified. Various coherence functions can be shaped with phase-only masks designed by simulated annealing optimization algorithm. We utilized this technique for a novel optical low-coherence reflectometry without any mechanical movement for scanning optical delay.
© 1999 Optical Society of America
(070.2590) Fourier optics and signal processing : ABCD transforms
(100.4550) Image processing : Correlators
(100.5090) Image processing : Phase-only filters
(110.4500) Imaging systems : Optical coherence tomography
(120.2830) Instrumentation, measurement, and metrology : Height measurements
Yuichi Teramura, Keiichi Suzuki, Masayuki Suzuki, and Fumihiko Kannari, "Low-Coherence Interferometry with Synthesis of Coherence Function," Appl. Opt. 38, 5974-5980 (1999)